Self-described cybersecurity expert Donald Trump is apparently not waiting to “get all the information, get briefed properly, and then make a decision” about Russia, as incoming press secretary Sean Spicerpromised earlier this week. With hours still to go before he was set to receive a classified intelligence briefing on Russia’s efforts to interfere with the 2016 election, the president-elect took to Twitter once again Thursday night to deride the “dishonest media” and cast doubts on the conclusion reached by multiple intelligence agencies that last year’s cyber attacks against Democrats were directed by the Kremlin with the explicit aim of undermining his opponent.

“How did NBC get ‘an exclusive look into the top secret report he (Obama) was presented?’ Who gave them this report and why? Politics!” Trump tweeted, casting doubt on a story originally published by The Washington Post that offered further evidence of Russia’s involvement. According to the Post, the 50-page classified document set to be presented to Trump at his Friday meeting with F.B.I. director James Comey, director of National Intelligence James Clapper Jr., C.I.A. director John Brennan, and N.S.A. head Mike Rogers, reveals that U.S. intelligence officials intercepted celebratory communications between high-level officials in the Russian government in the wake of Trump’s unexpected victory over Clinton. Hours later, NBC News published a subsequent story confirming details of the 50-page report, which was presented to President Barack Obama earlier Thursday, as well as offering additional evidence that Russians had been identified as the actors who turned over hacked Democratic documents to Wikileaks.

Trump’s tweet came less than 48 hours after the president-elect suggested on Twitter that he believed WikiLeaks founder Julian Assange, who claimed on Fox News Tuesday night that Russia had no involvement in the Democratic hacks, over his own U.S. intelligence officials. On Thursday, Trump complained that the “dishonest media” misinterpreted his tweet about Assange. “The media lies to make it look like I am against ‘Intelligence’ when in fact I am a big fan!”

Trump’s various swipes at the intelligence community in the past week are only the latest in an ongoing feud, of sorts, between the president-elect and the C.I.A. Previously, he characterized their conclusion that the Kremlin sought to aid him in his bid for the White House as “ridiculous” and “just another excuse” for Clinton and her allies, while also referencing the faulty 2003 intelligence George W. Bush cited in his decision to go to war as reason to be skeptical. (“Healthy American skepticism,”, Vice President-elect Mike Pence said.) On Wednesday, The Wall Street Journalreported that the president-elect and his transition team are planning to reduce the size of the C.I.A. and re-structure the Office of the Director of National Intelligence, which a source told the paper Trump believes have become too “politicized.” (Spicer denied the report, which he said was “100 percent false.”) On Thursday, former C.I.A. director James Woolseyresigned from the Trump transition team amid growing frustrations, saying he no longer wanted to “fly under false colors.”

Woolsey wasn't the only intelligence veteran to express displeasure with Trump's recent remarks. During a Senate Armed Service Committee on Thursday, Clapper pushed back on Trump’s narrative, asserting that U.S. intelligence agencies “stand more resolutely” behind their conclusion that the Russian government orchestrated the hacks. He also suggested that Trump’s attacks on the U.S. intelligence community were harming and undermining the agencies’ efforts, arguing that “there’s a difference between skepticism and disparagement.”

Woolsey’s resignation and Clapper’s comments, however, apparently did little to dissuade Trump from lashing out again Thursday ahead of his scheduled briefing. “The Democratic National Committee would not allow the FBI to study or see its computer info after it was supposedly hacked by Russia,” he tweeted, referring to a BuzzFeed News report that claimed the D.N.C. refused to give F.B.I. investigators access to its servers, delaying the investigation into the alleged Russian hacks. “So how and why are they so sure about hacking if they never even requested an examination of the computer servers? What is going on??” he wrote.